Rear wheel bare weight - Wrist Twisters
 
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post #1 of 11 Old 11-23-2014, 12:19 PM Thread Starter
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Rear wheel bare weight

Weighed my 900RR 6-spoke wheel before having a tyre mounted on it - 7.1 kg / 15.65lb [no disc, no cush drive but with bearings fitted].

Weighed the 3-spoker after the tyre had been taken off, again, no disc, no drive, with bearings - 6.7kg / 14.77lb.

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post #2 of 11 Old 11-23-2014, 12:39 PM
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Interesting, I want guessing that the 6 spoke wheel would weigh less. Oh well, we'll just have to start going carbon.

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post #3 of 11 Old 11-23-2014, 01:05 PM
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Im a relic, analog gauges and 3 spoke rims are just great for me. So this is good news again.

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post #4 of 11 Old 11-23-2014, 01:35 PM Thread Starter
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Quote:
Originally Posted by crimedog View Post
Interesting, I want guessing that the 6 spoke wheel would weigh less. Oh well, we'll just have to start going carbon.
Or magnesium [bring $$$]:


New Marchesini 10 spoke forged magnesium wheels. Currently used on the WSBK bikes. Slightly lighter than the 5 spoke cast magnesium wheels.
The forged magnesium wheel is lighter and offers more stiffness. The rim is also a little lighter which reduces dynamic weight and adds to the overall performance.. The forged wheel because it is completely machined also runs very true which improves the performance of the wheel.

Wheel weights with bearings:

NEW 10 spoke forged magnesium wheels : Front: 6.04lbs, Rear: 7.76lbs - See more at: Marchesini Forged Magnesium Wheels Honda CBR954RR - STREET BIKE WHEELS - WHEELS

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post #5 of 11 Old 11-25-2014, 02:58 AM
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Used CBR 900 rear wheel from ebay: averaging ~$100, heavier than stock, and probably bolts right on, or

Marchesini forged magnesium rear wheel from pretty much any source: ~$2400, about half the weight of stock, and certainly won't bolt right on, or

Marvic Piuma magnesium wheels, both front and rear: ~$2400, about 5/8 the weight of stock, and certainly won't bolt right on, or

Brock's Performance CF wheels, both front and rear: ~$3200, about 7/16 the weight of stock, certainly won't bolt right on, and will convert to CF dust in a crash, or

Stock: ~$0, no weight gain or loss. Bolts right on.

Hmmmm, which of these?

Rob

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On the other hand, if it has not been done never assume it is impossible to do it.
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post #6 of 11 Old 11-25-2014, 09:36 AM Thread Starter
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Ah, Rob, there you go again with that wisdom, reason and sagacity stuff.....

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post #7 of 11 Old 11-25-2014, 10:58 AM
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Quote:
Originally Posted by robtharalson View Post

Hmmmm, which of these?

Rob
900RR! I love the way they look!
On a race bike I would probably lose sleep over adding 14oz to my bike, but I never noticed it on this bike. The cost is a non-issue - the wheels were cheap on ebay, and a local guy stripped and powder coated them for $25 each. I made a nice profit when I sold the stock wheels.

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post #8 of 11 Old 11-25-2014, 11:07 AM
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Quote:
Originally Posted by mdtoney View Post

900RR! I love the way they look!
On a race bike I would probably lose sleep over adding 14oz to my bike, but I never noticed it on this bike. The cost is a non-issue - the wheels were cheap on ebay, and a local guy stripped and powder coated them for $25 each. I made a nice profit when I sold the stock wheels.
Same here ... six spokes all day long. =)

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post #9 of 11 Old 11-25-2014, 02:36 PM
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Quote:
Originally Posted by K1w1Boy View Post
Ah, Rob, there you go again with that wisdom, reason and sagacity stuff.....
Currently, it seems to be in short supply in the world. I'm coming close to cornering the market.

Over the years it was assumed glorified bicycle wheels would be the best and only way to do things. Cars had made the transition to more solid construction over 50 years before motorcycles due to the rapidly increasing vehicle weights wire spokes simply could not support. With the advent of high output four cylinder engines from Japan (Honda, and to a much greater degree Kawasaki) and Italy (MV) it rapidly became obvious wire spokes had reached their limit. The opening shot of a solution, which I was intimately involved with, came from Kimtab and Morris Industries -- cast wheels. The Kimtab snowflake magnesium wheels were wonderfully designed but terribly made, with seriously porous castings causing weakness and leaks when tubeless tires (originally made by Goodyear as part of a test project) were attempted. Learning from other's mistakes, Morris started with cast aluminum wheels of more or less conventional widths to use existing tube type tires. Not long after the first conversions done by Morris they were contacted by Yamaha to start a development project involving magnesium and greater widths for their TZ 750 project. This is where I came in -- Halibrand was responsible for the casting, and with plenty of extra material at the rim and hub areas we had lots of width and hub options. Eventually, we got a contract to supply Harley Davidson with wheels -- that's right, Harley was the first manufacturer to put cast wheels on production motorcycles!!! Too bad the engines were still stuck in the '20s. Not too long after that Kawasaki also contracted with Morris, but it became obvious it was just to get the wheels to copy with just enough modifications to not violate Morris patents. Brother was the front office mad! The only other manufacturer to move away from wire spokes was Honda with their Comstar wheels. A good solution for stock power, but started to fail when they were asked to handle more. By then the other three of the big four started to embrace the cast wheel and it has not abated since. Honda fell into line soon thereafter.

The point of all this is I have seen and been heavily involved in the transition to modern cast wheels and seen every possible permutation -- and the three hollow spoke is the best of the bunch from a load versus weight standpoint, and style as well IMNSHO. IOW, the wheels mounted on the 919 stock are just fine -- for me. The rest of you are certainly free to make whatever decisions you deem necessary to satisfy your needs / proclivities.

Oh, my stint at Morris was also instructional from a business point of view -- I could buy anything they had in stock for their cost plus 10%. I purchased a pair of Lockheed magnesium calipers for a grand total of $36 plus tax. They retailed in 1975 for $92 each. And they are still in use nearly 40 years later. Can't beat that.

Rob

If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
------- Rob --------
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post #10 of 11 Old 12-17-2014, 10:00 AM Thread Starter
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In another thread [grave-dig], Wallybanger wrote:

"The stock front, no tire but both disks weighs 16.4lbs. The 900RR rear, no tire, disk or drive weighs 15lbs. Now I just want the weight of the F3 front for comparison."

Just weighed my freshly-arrived F3 front and got 6.9kg [15.21lbs] with disks, bearings but no tyre.

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post #11 of 11 Old 12-19-2014, 01:16 PM Thread Starter
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Just had the tyre swap done off the 3-spoke on to the 6-spoke, and my measurement matches Wally's, pretty much - the 3-spoker weighs 16.3lb w disks and bearings but no tyre.

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